47-646-INK 25 mm Dia. N-BK7/N-SF5 Achromatic Doublet; EFL=225mm VIS 0° 425-675nm

The 47-646-INK is a high-quality 25 mm diameter achromatic doublet lens, designed and manufactured by Edmund Optics. This lens boasts an effective focal length (EFL) of 225mm, specifically tailored for the visible light spectrum, spanning 425-675nm.

The lens is constructed from two types of glass, N-BK7 and N-SF5, both from Schott, ensuring superior optical performance. The N-BK7, a borosilicate crown glass, is known for its excellent homogeneity and low optical dispersion, making it ideal for use in achromatic doublets. The N-SF5, a dense flint glass, further reduces chromatic aberration, contributing to the lens's high-resolution imaging capabilities.

The lens features a standard anti-reflection coating on both the front and back surfaces, specifically the EDM VIS-0 STD curve. This coating reduces surface reflections, enhancing light transmission and improving overall image quality.

The lens geometry includes a thickness of 4.67mm at the edge, with a central thickness of 3mm and a central thickness 'a' of 2.5mm. The lens's curvature is defined by radii r1, r2, and r3, which are 139.53mm, -100.21mm, and -291.32mm, respectively.

According to the provided data, the lens is currently in stock and available for immediate purchase. For more detailed information, including pricing and availability, please refer to the vendor's website using the provided weblink.